18668688 has 20 divisors (see below), whose sum is σ = 48227568. Its totient is φ = 6222880.

The previous prime is 18668687. The next prime is 18668693. The reversal of 18668688 is 88686681.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 18668688.

It is not an unprimeable number, because it can be changed into a prime (18668687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194418 + ... + 194513.

Almost surely, 2^18668688 is an apocalyptic number.

It is an amenable number.

18668688 is an abundant number, since it is smaller than the sum of its proper divisors (29558880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18668688 is a wasteful number, since it uses less digits than its factorization.

18668688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388942 (or 388936 counting only the distinct ones).

The product of its digits is 884736, while the sum is 51.

The square root of 18668688 is about 4320.7277164848. The cubic root of 18668688 is about 265.2800551820.

The spelling of 18668688 in words is "eighteen million, six hundred sixty-eight thousand, six hundred eighty-eight".